diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 27fc237..f2de692 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -49,6 +49,7 @@ ### Commit Types:
 ### Python Styleguide
 
 - Follow PEP 8
+- Please use Black to format your code first
 - Use meaningful variable names
 - Comment your code, but don't overdo it